Dear R community,    Can I please get some advice on the following: I wish
to obtain a list of residuals, padded by NAs for NAs in my source data. I
tried several options of "na.action", but did not succeed...

Example: I would like to get "0,0,0,0,NA,NA":
> a
[1]  1  2  3  4 NA  9
> b
[1]  3  4  5  6  7 NA
> lm(a~b)$residuals
1 2 3 4
0 0 0 0
> lm(a~b,na.action=na.exclude)$residuals
1 2 3 4
0 0 0 0

Thank you and best regards!
Georg.
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Georg Ehret
Johns Hopkins
Baltimore, USA

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